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https://github.com/VCMP-SqMod/SqMod.git
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77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
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/************************************************************************************
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*
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* D++, A Lightweight C++ library for Discord
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*
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* Copyright 2021 Craig Edwards and D++ contributors
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* (https://github.com/brainboxdotcc/DPP/graphs/contributors)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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************************************************************************************/
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#pragma once
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#include <dpp/export.h>
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#ifdef _WIN32
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#include <WinSock2.h>
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#include <WS2tcpip.h>
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#else
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#include <netinet/in.h>
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#include <netdb.h>
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#include <sys/socket.h>
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#endif
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#include <sys/types.h>
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#include <string>
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#include <unordered_map>
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namespace dpp {
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/**
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* @brief Represents a cached DNS result.
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* Used by the ssl_client class to store cached copies of dns lookups.
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*/
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struct dns_cache_entry {
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/**
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* @brief Resolved address information
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*/
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addrinfo addr;
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/**
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* @brief Socket address.
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* Discord only supports ipv4, but sockaddr_in6 is larger
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* than sockaddr_in, sockaddr_storage will hold either. This
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* means that if discord ever do support ipv6 we just flip
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* one value in dns.cpp and that should be all that is needed.
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*/
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sockaddr_storage ai_addr;
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/**
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* @brief Time at which this cache entry is invalidated
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*/
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time_t expire_timestamp;
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};
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/**
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* @brief Cache container type
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*/
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using dns_cache_t = std::unordered_map<std::string, dns_cache_entry*>;
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/**
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* @brief Resolve a hostname to an addrinfo
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*
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* @param hostname Hostname to resolve
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* @param port A port number or named service, e.g. "80"
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* @return dns_cache_entry* First IP address associated with the hostname DNS record
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* @throw dpp::connection_exception On failure to resolve hostname
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*/
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const dns_cache_entry* resolve_hostname(const std::string& hostname, const std::string& port);
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};
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